Add the cpread utility

diff --git a/src/examples/Makefile b/src/examples/Makefile
index 85f219046a668d6e8a597a91b257a1444949cb2c..e42f8236696a2e69b5e6ef3cb1e2977abe37c25c 100644 (file)
--- a/src/examples/Makefile
+++ b/src/examples/Makefile
@@ -1,6 +1,6 @@
 .PHONY: all
 
-PROGS = cpmfg cpio cptwiddle
+PROGS = cpmfg cpread cpio cptwiddle
 # LDFLAGS += -lusb
 
 all: $(PROGS)

diff --git a/src/examples/cpread.c b/src/examples/cpread.c
new file mode 100644 (file)
index 0000000..f5a5d8a
--- /dev/null
+++ b/src/examples/cpread.c
@@ -0,0 +1,139 @@
+/**
+ * cpcfg.c
+ *
+ * Read the configuration of a cp2103-equipped device.
+ */
+
+#include <netinet/in.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#define VID    0x10c4
+#define PID    0xea60
+
+/* CP2103 ioctls */
+#define IOCTL_GPIOGET          0x8000  /* Get gpio bits */
+#define IOCTL_GPIOSET          0x8001  /* Set gpio bits */
+#define IOCTL_GPIOBIC          0x8002  /* Clear specific gpio bit(s) */
+#define IOCTL_GPIOBIS          0x8003  /* Set specific gpio bit(s) */
+
+/* CP210x ioctls principally used during initial device configuration */
+#define IOCTL_DEVICERESET      0x8004  /* Reset the cp210x */
+#define IOCTL_PORTCONFGET      0x8005  /* Get port configuration */
+#define IOCTL_PORTCONFSET      0x8006  /* Set port configuration */
+#define IOCTL_SETVID           0x8007  /* Set vendor id */
+#define IOCTL_SETPID           0x8008  /* Set product id */
+#define IOCTL_SETMFG           0x8009  /* Set manufacturer string */
+#define IOCTL_SETPRODUCT       0x800a  /* Set product string */
+#define IOCTL_SETSERIAL                0x800b  /* Set serial number string */
+#define IOCTL_SETDEVVER                0x800c  /* set device version id */
+/* FIXME: where is IOCTL_SETMFG? */
+
+/* CP2103 GPIO */
+#define GPIO_0         0x01
+#define GPIO_1         0x02
+#define GPIO_2         0x04
+#define GPIO_3         0x08
+#define GPIO_MASK      (GPIO_0|GPIO_1|GPIO_2|GPIO_3)
+
+/* Port config definitions */
+typedef struct {
+    uint16_t mode;             /* Push-pull = 1, Open-drain = 0 */
+    uint16_t lowPower;
+    uint16_t latch;            /* Logic high = 1, Logic low = 0 */
+} cp2101_port_state_t;
+
+typedef struct {
+    cp2101_port_state_t reset;
+    cp2101_port_state_t suspend;
+    uint8_t enhancedFxn;
+} cp2101_port_config_t;
+
+#define PORT_CONFIG_LEN        13      /* Because sizeof() will pad to full words */
+
+/* Used to pass variable sized buffers between user and kernel space (ioctls) */
+typedef struct {
+       char* buf;
+       size_t len;
+} cp210x_buffer_t;
+
+void exit(int);
+
+int cpConnect(char* device)
+{
+    int ret, ioval;
+    int fd = open(device, O_RDWR);
+    if (fd < 0) {
+       fprintf(stderr, "cannot open %s\n", device);
+       exit(1);
+    }
+    printf("%s opened\n", device);
+    return fd;
+}
+
+void cpDisconnect(int fd)
+{
+    if (fd >= 0)
+       close(fd);
+}
+
+void printState(cp2101_port_state_t* state)
+{
+    printf("m:0x%02x  lp:0x%02x  l:0x%02x", state->mode, state->lowPower,
+           state->latch);
+}
+
+void printConfig(cp2101_port_config_t* config)
+{
+    printf("config: reset: "); printState(&config->reset);
+    printf("\nconfig: suspend: "); printState(&config->reset);
+    printf("\nenhancedFxn: 0x%02x\n", config->enhancedFxn);
+}
+
+void cpReset(int fd)
+{
+    int ret;
+
+    /* Reset the part */
+    if ((ret = ioctl(fd, IOCTL_DEVICERESET, 0))) {
+       fprintf(stderr, "device reset ioctl %d\n", ret);
+       exit(1);
+    }
+}
+
+int main(int argc, char* argv[])
+{
+    cp2101_port_config_t config;
+    uint8_t gpio = 0xff;
+    int ret;
+    int fd;
+
+    if (argc != 2) {
+      fprintf(stderr, "usage: %s <tty>\n", argv[0]);
+      exit(1);
+    }
+
+    fd = cpConnect(argv[1]);
+
+    /* Read the current port configuration */
+    if ((ret = ioctl(fd, IOCTL_PORTCONFGET, &config))) {
+       fprintf(stderr, "portconfget ioctl failed %d\n", ret);
+       return 1;
+    }
+
+    /* Read the current gpio latches */
+    if ((ret = ioctl(fd, IOCTL_GPIOGET, &gpio))) {
+       fprintf(stderr, "gpioget ioctl failed %d\n", ret);
+       return 1;
+    }
+
+    printConfig(&config);
+    printf("gpio = 0x%0x\n", gpio);
+
+    cpDisconnect(fd);
+    return 0;
+}